I own one. I use LM4562 opamp.
This soundcard is so close to my 5000$ cd player ... is-it really a better soundcard ?
It's the deal IMO.
THis soundcard is able to drive 600 ohms DT990 without any problem with very loud SPL.
This soundcard is DEAD QUIET ... no hiss, no humm, no strange PC sound .. DEAD QUIET.